1. KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Korea
2. Department of Chemistry Rice University 6100 Main Street Houston Texas 77005 United States
3. Department of Physics and Astronomy Institute of Applied Physics Seoul National University Seoul 08826 Korea
4. Department of Integrative Energy Engineering Korea University Seoul 02841 Korea
5. Center for Neuromorphic Engineering Korea Institute of Science and Technology Seoul 02792 Korea